Model FBPB4510A FBPB4510B FBPB4510C FBPB4510D  FBPB4510E Rated Voltage   12VDC    12VDC    12VDC   12VDC    12VDC Operating Voltage   3~16VDC  3~16VDC  3~16VDC  3~16VDC  3~16VDC Max.Rated Current  35mA at 12VDC 35mA at 12VDC 35mA at 12VDC 35 (20)mA at 12VDC 35(20)mA at 12VDC Min.Sound Pressure Level 105dB at 12VDC/30cm 92dB at 12VDC/30cm 92dB at 12VDC/30cm 105(92)dB at 12VDC/30cm 105(92)dB at 12VDC/30cm Resonant Frequency 3.2±0.5KHz 3.2±0.5KHz 3.2±0.5KHz 3.2±0.5KHz 3.2±0.5KHz Operating Temperature -20~+60°C -20~+60°C -20~+60°C -20~+60°C -20~+60°C Tone Nature Continuous Slow Pulse Fast Pulse Continuous+Slow Pulse Continuous+Fast Pulse